Remove expat from generate_licenses.py.

This library is not used by WebRTC anymore.

Bug: chromium:896154
Change-Id: Ifc2f30b9425ef7ca3ff665cc03d11932316df71c
Reviewed-on: https://webrtc-review.googlesource.com/c/106780
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25248}
diff --git a/tools_webrtc/libs/generate_licenses.py b/tools_webrtc/libs/generate_licenses.py
index 892fb46..d1a76a6 100755
--- a/tools_webrtc/libs/generate_licenses.py
+++ b/tools_webrtc/libs/generate_licenses.py
@@ -36,7 +36,6 @@
     'bazel': ['third_party/bazel/LICENSE'],
     'boringssl': ['third_party/boringssl/src/LICENSE'],
     'errorprone': ['third_party/errorprone/LICENSE'],
-    'expat': ['third_party/expat/files/COPYING'],
     'fiat': ['third_party/boringssl/src/third_party/fiat/LICENSE'],
     'guava': ['third_party/guava/LICENSE'],
     'ijar': ['third_party/ijar/LICENSE'],